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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafae1980f841ea6433b0ba19361983c54d73e07cca261bfc339e53620dde9c2' 
  AND token = '8N2jRQym6+qQQB57nl8Hkl0B1hzukMpEhFV39oO43L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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