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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f65e1f09cffe5b6327ef7bf8c05d4a5af70002ea15b4973e60616e5a5e29875' 
  AND token = 'Rp3poZFEggVFgNqSQ8QZ3kiD7kM5rraNGP5G/xVOdlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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