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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31e8cfc2ccc0063aa217914af75b7b612910b85c7ade0760a119e1e8a6ffcc0' 
  AND token = 'igGehXdy3TnjksMqqW6H2gZwBBR4UaMt4w5JyTDMKC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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