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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fe977d14541f257a0071cb2b300991aa2227492cbe0796de9c1d4aa3e607cb' 
  AND token = '9aAqRbu+CsmAwiHp4+msNQw7iUo7e4K15xbWMV5Kphs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}