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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5d96814692aef3d4852f86e105feee98793110de4f22638c14906aeb21bbfc' 
  AND token = 'hc51yZLGqx39LduwOZRTP4e7hkDQ8k1LvoFq2EbUV1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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