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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d1aa1a03ed9ddec0e9c923f2c5905999f3d07d4f5de3ef8c05ffe07b05edbb' 
  AND token = 'dPcry0eq/9L4VsCPKE0CAuu0i4VG+lXzqDGsahbGK60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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